On November 2nd I got my regular period. Two days after it ended I had unprotected sex with my boyfriend. Out of concern, he suggested I take Plan B. Two days later, I took the pill (Nov. 11) and after a day or so had a strange type of bleeding (brownish blood). This lasted only 2-3 days. I have not had a period since, and it's now Dec. 18th. We had protected sex in this time. Did the pill throw my cycle off? Or could I be pregnant?